Planned Release Date: Nov 13, 2026

About This Game

Murder Mystery Online is a first-person 3D online murder mystery for you and your friends. You all walk into the same crime scene, investigate it yourselves, and talk your way to the truth. Everyone takes a role. What really happened is waiting in the scene, and in what everyone says.

Walk it. Search it.

Explore a connected 3D scene in first person. Open drawers, chests and doors, sweep your flashlight into the corners, and examine anything suspicious. What you find goes into your own notebook. No one else can read it.

A photo is a clue

During investigation, raise your camera and shoot the scene. Film is limited. Each photo carries the clues that were actually in frame. Bring them to the board during the debate, and if someone posts a photo that implicates you, a rebuttal helper suggests how to answer.

Argue to win

After the investigation, each player takes a turn presenting. Pin photos and notes to the board, link them with arrows, and make your case. Voice chat is built in. During investigation you can only hear people who are close, so a private conversation in a corner is possible. Your voice is converted to your role's voice.

Name the culprit in the dark

When it is time to vote, every player enters a black space alone. The other suspects stand with their backs to you. Walk up behind one and accuse. Once everyone has voted, a narrator announces the result.

Rewatch it.

Every match is recorded automatically (kept for 30 days). Replay it from any player's point of view or a free camera.

Start free. One player buys, everyone plays.

The base game is free. Anyone can open a room for the free case The Manor Across the River and the Mystery Lodge hangout right away. For paid episodes, only the player who creates the room needs to own it; every friend with the room code joins free.

Cases

FREE · The Manor Across the River | 5 players | 80 min | difficulty 2/5

A storm has taken the only bridge. In a remote manor across the river, the master celebrates his birthday. Just before dessert, he is found dead in his locked study.

EP.1 The All-Night Rite | 5 players | 120+ min | difficulty 3.5/5

"A chochiseong is a rite that runs all night. It begins when the sun goes down and ends only when the sun comes up. Until then, the house is locked from the inside."

On the night of the full moon, five people gather at a shrine halfway up the mountain. Less than an hour after sundown, the shaman is dead.

EP.2 Three Days | 5–6 players | 120+ min | difficulty 4/5

"A youth co-op with a dream: bring the countryside back to life."

On the night of December 19, the head of the youth co-op is found inside a built-in wardrobe, dead for three days. Yet across those same three days, every one of the other five had heard from them.

FREE · Mystery Lodge | 1–8 players | a hangout with no case

A snowbound log cabin with a crackling fire. Sit around with friends, talk, and learn the controls. You can go in alone.

New episodes are in development.

In-game language: Korean

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Some of this game's content was made with generative AI before release: parts of the illustrations and textures, the voices (text-to-speech narration and character lines), and parts of the 3D models. During play, AI models are used for three features: voice chat is transcribed by a speech-to-text model for replay subtitles and reports; a voice conversion model running on the player's PC changes the player's voice into the role's voice; and when a player asks the manor maid a question, a language model picks one of her pre-written answers.

Connects to 3rd-Party Service for AI Content Generation: Cloudflare Workers AI (Whisper speech-to-text), OpenAI API (question matching for the maid), on-device voice conversion model

Mature Content Description

The developers describe the content like this:

This game is a murder mystery. The crime scene contains a dead body lying on the floor, with bloodstains on the clothing, floor and wall. A creature appears briefly during the investigation and flees; it never attacks players. There is no dismemberment, no close-up of wounds, and the killing itself is never shown. The story deals with death and grief in a shaman's shrine setting and may be unsettling. Players can talk to each other through voice and text chat.